Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The principles of physiology applied to the preservation of health, and to the improvement of physical and mental education
The principles of physiology applied to the preservation of health, and to the improvement of physical and mental education